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Ps Chapter 5


Work Transfer of energy that occurs when a force makes an object move;measured in joules
Power Amount of work done, or the amount of energy transferred, divided by the time required to do the work or transfer the energy; measured in watts
Machine Device that makes doing work easier by increasing the force applied to an object, changing the direction of the applied force increasing the distance over which a force can be applied
Input Force The force that is applied a machine
Output Force The force applied by the machine
Mechanical Advantage Ratio of the output force exerted by a machine to the input force applied to to the machine
Efficiency ratio of the output work done by the machine to the input work done on the machine, expressed as a percentage
Simple Machine Machine that does work with only one movement--lever pulley, wheel and axle, inclined plane, screw, and wedge.
Lever Simple Machine consisting of a bar bree to pivot about a fixed point called a fulcrum
Pulley Simple machine that consists of a grooved wheel with a rope, chain, or cable running along the groove; can be either fixed or moveable
Wheel and Axle Simple machine that consists of a shpft or axle attached to the center of a larger wheel so that the shaft and the wheel rotate together
Inclined Plane Simple machine that consists of a sloping surface, such as a ramp, that reduces the amount of force needed to lift something by increasing the distance over which the force is applied
Screw Simple machine that consists of an inclined plane wrapped in spiral around a cylindrical post
Wedge Simple machine that is an inclined plane with one or two sloping sides
Compound Machine Machine that is a combination of two or more simple machines
Created by: JohnCook